Joseph Reader and Nicolo Acquista, "4s24p3–4s4p4 and 4s24p3–4s24p25s transitions in Y vii, Zr viii, Nb ix, and Mo x," J. Opt. Soc. Am. 71, 434-441 (1981)
Spectra of ionized Y, Zr, Nb, and Mo have been observed in sliding-spark and triggered-spark discharges on 10.7-m normal- and grazing-incidence spectrographs at the National Bureau of Standards in Washington, D.C. From these observations the 4s24p3–4s4p4 transitions in Y vii, Zr viii, Nb ix, and Mo x have been identified. The 4s24p3–4s24p25s transitions in Y vii-Mo x, previously identified by Rahimullah et al. [
Phys. Scr. 14,
221–
223 (
1976);
Phys. Scr. 18,
96–
106 (
1978)], have been confirmed. In Y vii the 4s24p3–4s24p26s and 4s4p4–4p5 transitions also have been found. The parameters obtained from least-squares fits to the energy levels are compared with Hartree–Fock calculations. Preliminary values of the ionization energies have been determined as 110.02 ± 0.15 eV for Y vii, 133.7 ± 0.5 eV for Zr viii, 159.2 ± 0.7 eV for Nb ix, and 186.4 ± 1.2 eV for Mo x.
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Symbols: p, perturbed by close line; u, unresolved from close line.
Doubly classified.
Ionization stage not certain.
Perturbed by λ374.165 of O III.
Perturbed by second-order line of Y V.
Possibly perturbed by second-order line.
Blended with line of lower ionization stage.
Table 2
4s24p3–4s24p26s and 4s4p4–4p5 Transitions in Y vii
Transition
λ (Å)
Intensity
4s24p3 4S3/2–4s24p2 6s
2D5/2
157.364
10
2P1/2
2S1/2
161.789
100
4s3/2
4P5/2
161.967
6 000
2D3/2
2D3/2
162.798
500
2D3/2
2D5/2
162.901
400
2P3/2
2S1/2
163.619
200
4S3/2
4P3/2
163.784
2 500
2D5/2
2D3/2
164.002
20
2D5/2
2D5/2
164.108
3 000
4S3/2
4P1/2
166.059
1 500
2D3/2
2P3/2
167.443
200
2P1/2
2D3/2
168.491
20
2D5/2
2P3/2
168.716
5 000
2D5/2
4P5/2
169.122
500
2D3/2
2P1/2
169.364
2 500
2D3/2
4P3/2
169.793
50
2P3/2
2D3/2
170.478
2 500
2P1/2
2D5/2
170.591
400
2D5/2
4P3/2
171.103
300
2D3/2
4P1/2
172.237
500
2P1/2
2P3/2
173.472
600
2P1/2
2P1/2
175.532
500
2P3/2
2P3/2
175.581
600
4s4p4 4P3/2–4p5
2P1/2
438.001
2
4P1/2
2P1/2
444.114?
30
4P5/2
2P3/2
446.766
15
2D3/2
2P1/2
506.801
50
2D3/2
2P1/2
541.472
40
2D5/2
2P3/2
548.113
1 000
2P3/2
2P1/2
602.428
10
2S1/2
2P3/2
650.573
10
2P3/2
2P3/2
652.057
800
2P1/2
2P1/2
656.633
4 000
Table 3
Energy Levels of the 4s24p3, 4s4p4, and 4s24p25s Configurations of Y vii, Zr viii, Nb ix, and Mo x
Y vii
Zr viii
Nb ix
Mo x
Configuration
Term
J
Energy Level (cm−1)
Uncertainty (cm−1)
Energy Level (cm−1)
Uncertainty (cm−1)
Energy Level (cm−1)
Uncertainty (cm−1)
Energy Level (cm−1)
Uncertainty (cm−1)
4s24P3 4S
3/2
0.0
0.8
0.0
1.3
0
3
0
5
2D
3/2
21 611.0
0.7
23 155.7
1.0
24 881
2
26 886
3
2P
5/2
26 120.6
0.7
28 929.8
1.2
32 026
3
35 522
3
1/2
42 364.4
0.8
46 380.8
1.1
50 672
3
55 313
3
3/2
49 288.5
0.6
55 605.1
0.9
62 632
3
70 544
2
4s4P4 4P
5/2
170 602.9
0.6
188 313.2
0.8
206 399
3
224 939
6
3/2
178 759.1
1.1
198 457.2
2.4
218 801
4
239 891
6
2D
1/2
181 904.3
0.7
202 105.3
1.2
222 929
4
244 457
6
3/2
209 749.9
0.7
231 511.0
1.4
253 745
2
276 573
4
2S
5/2
211 987.8
0.8
234 478.0
1.5
257 598
3
281 535
3
1/2
240 721.7
0.9
264 870.9
1.8
289 397
3
314 504
3
2P
3/2
241 071.3
0.8
266 477.5
1.4
292 173
3
318 423
2
1/2
254 774.0
1.1
282 860.3
2.2
311 737
4
341 642
4
4s24p25s4P
1/2
398 054
4
473 532
8
553 867
12
638 999
14
3/2
405 878
3
483 622
6
566 634
12
654 947
12
2P
5/2
412 177
6
490 913
8
574 934
14
664 258
15
1/2
411 076
5
489 084
8
572 400
15
660 981
14
2D
3/2
417 527
4
496 387
5
580 533
10
669 948
11
5/2
431 523
4
512 828
6
599 844
10
692 660
13
2S
3/2
432 898
4
514 585
6
602 011
10
695 263
13
1/2
456 682
6
539 792
8
628 560
12
723 115
14
Table 4
4p5 and 4s24p26s Levels of Y vii
Configuration
Term
J
Energy Level (cm−1)
Uncertainty (cm−1)
4p5 2P
3/2
394 432.2
0.8
1/2
407 066.4
1.0
4s24p26s4P
1/2
602 201
13
3/2
610 563
10
5/2
617 410
13
2P
1/2
612 058
12
3/2
618 828
9
2D
5/2
635 479
10
3/2
635 870
9
2S
1/2
660 459
14
Table 5
Energy Parameters (in cm−1) and Mean Errors Δ of Least-Squares Fits for the 4s24p3 Configurations of Y vii, Zr viii, Nb ix, and Mo xa
Ion
Parameter
HF
Fitted
Fitted–HF
Y vii
Eav
30 535
26 253 ± 2
F2(4p4p)
80 390
66 751 ± 16
0.8303 ± 0.0002
ζ4p
8 638
9 593 ± 5
1.1106 ±0.0006
α(4p4p)
−56 ± 1
Δ
5
Zr viii
Eav
33 185
29 069 ± 4
F2(4p4p)
85 790
71 722 ± 26
0.8360 ± 0.0003
ζ4p
10 669
11 823 ± 7
1.1082 ± 0.0007
α(4p4p)
−60 ±2
Δ
8
Nb ix
Eav
36 014
32 177 ± 3
F2(4p4p)
91 049
76 622 ± 21
0.8415 ± 0.0002
ζ4p
12 975
14 345 ± 5
1.1056 ± 0.0004
α(4p4p)
−65 ±1
Δ
6
Mo x
Eav
39 088
35 673 ± 6
F2(4p4p)
96 194
81 377 ± 44
0.8460 ± 0.0005
ζ4p
15 577
17 230 ± 11
1.1061 ± 0.0007
α(4p4p)
−66 ±3
Δ
13
The value of Eav listed in the HF column is that obtained by diagonalizing the energy matrix with the HF parameters, 4S3/2 level, set at zero.
Table 6
Energy Parameters (in cm−1) and Mean Errors Δ of Least-Squares Fits for the 4s4p4 Configurations of Y vii, Zr viii, Nb ix, and Mo x
Ion
Parameter
HF
Fitted
Fitted–HF
Y vii
Eav
211 724
205 632 ± 144
F2(4p4p)
80 303
74 193 ± 1239
0.924 ± 0.015
G1(4p4s)
106 883
66 590 ± 457
0.623 ± 0.004
ζ4p
8 619
8579 ± 246
0.995 ±0.029
α(4p4p)
−1 344 ± 80
Δ
388
Zr viii
Eav
231 340
227408 ± 150
F2(4p4p)
85 698
79 134 ± 1254
0.923 ± 0.015
G1(4p4s)
113 756
73 055 ± 477
0.642 ± 0.004
ζ4p
10 645
10 738 ± 255
1.009 ± 0.024
α(4p4p)
−1 451 ± 83
Δ
404
Nb ix
Eav
250 157
249 694 ± 163
F2(4p4p)
90 952
84 111 ± 1359
0.925 ± 0.015
G1(4p4s)
120 450
79 165 ± 525
0.657 ± 0.004
ζ4p
12 947
13 157 ± 280
1.016 ± 0.022
α(4p4p)
−1 550 ± 90
Δ
438
Mo x
Eav
268 937
272 641 ± 185
F2(4p4p)
96 095
89 091 ± 1566
0.927 ± 0.016
G1(4p4s)
126 999
85 046 ± 607
0.670 ± 0.005
ζ4p
15 545
15 879 ± 322
1.021 ± 0.021
α(4p4p)
−1 640 ± 103
Δ
496
Table 7
Energy Parameters in (cm−1 and Mean Errors Δ of Least-Squares Fits for the 4s24p25s Configurations of Y vii, Zr viii, Nb ix, and Mo x
Ion
Parameter
HF
Fitted
Fitted–HF
Y vii
Eav
426 349
420 633 ± 6
F2(4p4p)
81 821
66 883 ± 64
0.8174 ± 0.0008
G1(4p5s)
9 032
7 396 ± 20
0.819 ± 0.002
ζ4p
9 072
9 994 ±16
1.102 ± 0.002
α(4p4p)
−71 ±6
Δ
17
Zr viii
Eav
505 190
500 186 ± 6
F2(4p4p)
87 122
71 594 ± 62
0.8218 ± 0.0007
G1(4p5s)
9 844
7 994 ± 19
0.812 ± 0.002
ζ4p
11 146
12 266 ± 14
1.100 ± 0.001
α(4p4p)
−73 ±6
Δ
15
Nb ix
Eav
589 679
585 167 ± 7
F2(4p4p)
92 301
76 240 ± 81
0.8260 ± 0.0009
G1(4p5s)
10 632
8 639 ± 25
0.813 ± 0.002
ζ4p
13 496
14 831 ± 17
1.099 ± 0.001
α(4p4p)
−72 ±8
Δ
19
Mo x
Eav
680 585
675 609 ± 8
F2(4p4p)
97 382
80 S85 ± 87
0.8306 ± 0.0009
G1(4p4s)
11 403
9 255 ± 28
0.812 ± 0.002
ζ4p
16 145
17 750 ± 17
1.099 ± 0.001
α(4p4p)
−72 ± 8
Δ
21
Table 8
Energy Parameters (in cm−1) and Mean Errors Δ of Least-Squares Fits for the 4p5 and 4s24p26s Configurations of Y vii
Configuration
Parameter
HF
Fitted
Fitted–HF
4p5
Eav
422 786
398 644
ζ4p
8 603
8 423
0.979
4s2 4p2 6s
Eav
622 046
624 243 ± 74
F2(4p4p)
82 257
66 853 ± 756
0.813 ± 0.009
G1(4p6s)
3 013
2 277 ± 280
0.756 ± 0.093
ζ4p
9 163
10 200 ± 188
1.113 ± 0.021
α(4p4p)
−92 ± 69
Δ
197
Table 9
Percentage Compositions for the 4s24p3 Levels of Y vii, Zr viii, Nb ix, and Mo x
Calculated Energy Level Values (in cm−1) and Percentage Compositions for the 4s24p26s Configuration of Y vii
J
Observed Energy Levels
Calculated Energy Levels
Observed – Calculated Energy Levels
Percentage (J1j)
Percentage Composition (LS)
1/2
602 201
602 191
10
87% (3P0, 1/2)
72% 4P + 22% 2P + 6% 2S
612 058
612 099
−41
99% (3P1, 1/2)
76% 2P + 24% 4P
660 459
660 459
0
88% (1S0, 1/2)
94% 2S + 4% 4P + 2% 2P
3/2
610 563
610 775
−212
99% (3P1, 1/2)
89% 4P + 11% 2P
618 828
618 740
88
80% (3P2, 1/2)
70% 2P + 23% 2D + 7% 4P
635 870
635 915
−45
80% (1D2, 1/2)
77% 2D + 20% 2P + 3% 4P
5/2
617 410
617 167
243
77% (3P2, 1/2)
81% 4P + 19% 2D
635 479
635 513
−34
77% (1D2, 1/2)
81% 2D + 19% 4P
Table 12
Differences (in cm−1) between Observed Level Values and Those Calculated with the Fitted Values of the Parameters for the 4s24p3, 4s4p4, and 4s24p25s Configurations of Y vii, Zr viii, Nb ix, and Mo x
Configuration
J
Term
Y vii
Zr viii
Nb ix
Mo x
4s24p3
1/2
2P
2
3
2
3
3/2
4S
0
0
0
2
2D
−3
−5
−4
−9
2p
−2
−2
−1
−2
5/2
2D
3
5
4
8
4s4p4
1/2
4P
161
127
98
68
2S
210
182
181
196
2P
−266
−271
−289
−318
3/2
4P
162
183
216
260
2D
−295
−336
−381
−450
2P
60
100
126
152
5/2
4P
−329
−315
−319
−333
2D
292
333
374
437
4s24p25s
1/2
4P
−2
−4
−10
−12
2S
0
0
1
1
2P
−8
−4
2
4
3/2
4P
−13
−10
−11
−9
2D
−8
−11
−19
−19
2P
14
12
7
10
5/2
4P
17
18
21
24
2D
−1
−1
2
2
Table 13
Ionization Energies of Y vii, Zr viii, Nb ix, and Mo x
Ionization Energy
Ion
(cm−1)
(eV)
Y vii
887 400 ± 1 200
110.02 ± 0.15
Zr viii
1 078 000 ± 4 000
133.7 ± 0.5
Nb ix
1 284 000 ± 6 000
159.2 ± 0.7
Mo x
1 503 000 ± 10 000
186.4 ± 1.2
Tables (13)
Table 1
4s24p3–4s4p4 and 4s24p3–4s24p25s Transitions in Y vii, Zr viii, Nb ix, and Mo xa
Symbols: p, perturbed by close line; u, unresolved from close line.
Doubly classified.
Ionization stage not certain.
Perturbed by λ374.165 of O III.
Perturbed by second-order line of Y V.
Possibly perturbed by second-order line.
Blended with line of lower ionization stage.
Table 2
4s24p3–4s24p26s and 4s4p4–4p5 Transitions in Y vii
Transition
λ (Å)
Intensity
4s24p3 4S3/2–4s24p2 6s
2D5/2
157.364
10
2P1/2
2S1/2
161.789
100
4s3/2
4P5/2
161.967
6 000
2D3/2
2D3/2
162.798
500
2D3/2
2D5/2
162.901
400
2P3/2
2S1/2
163.619
200
4S3/2
4P3/2
163.784
2 500
2D5/2
2D3/2
164.002
20
2D5/2
2D5/2
164.108
3 000
4S3/2
4P1/2
166.059
1 500
2D3/2
2P3/2
167.443
200
2P1/2
2D3/2
168.491
20
2D5/2
2P3/2
168.716
5 000
2D5/2
4P5/2
169.122
500
2D3/2
2P1/2
169.364
2 500
2D3/2
4P3/2
169.793
50
2P3/2
2D3/2
170.478
2 500
2P1/2
2D5/2
170.591
400
2D5/2
4P3/2
171.103
300
2D3/2
4P1/2
172.237
500
2P1/2
2P3/2
173.472
600
2P1/2
2P1/2
175.532
500
2P3/2
2P3/2
175.581
600
4s4p4 4P3/2–4p5
2P1/2
438.001
2
4P1/2
2P1/2
444.114?
30
4P5/2
2P3/2
446.766
15
2D3/2
2P1/2
506.801
50
2D3/2
2P1/2
541.472
40
2D5/2
2P3/2
548.113
1 000
2P3/2
2P1/2
602.428
10
2S1/2
2P3/2
650.573
10
2P3/2
2P3/2
652.057
800
2P1/2
2P1/2
656.633
4 000
Table 3
Energy Levels of the 4s24p3, 4s4p4, and 4s24p25s Configurations of Y vii, Zr viii, Nb ix, and Mo x
Y vii
Zr viii
Nb ix
Mo x
Configuration
Term
J
Energy Level (cm−1)
Uncertainty (cm−1)
Energy Level (cm−1)
Uncertainty (cm−1)
Energy Level (cm−1)
Uncertainty (cm−1)
Energy Level (cm−1)
Uncertainty (cm−1)
4s24P3 4S
3/2
0.0
0.8
0.0
1.3
0
3
0
5
2D
3/2
21 611.0
0.7
23 155.7
1.0
24 881
2
26 886
3
2P
5/2
26 120.6
0.7
28 929.8
1.2
32 026
3
35 522
3
1/2
42 364.4
0.8
46 380.8
1.1
50 672
3
55 313
3
3/2
49 288.5
0.6
55 605.1
0.9
62 632
3
70 544
2
4s4P4 4P
5/2
170 602.9
0.6
188 313.2
0.8
206 399
3
224 939
6
3/2
178 759.1
1.1
198 457.2
2.4
218 801
4
239 891
6
2D
1/2
181 904.3
0.7
202 105.3
1.2
222 929
4
244 457
6
3/2
209 749.9
0.7
231 511.0
1.4
253 745
2
276 573
4
2S
5/2
211 987.8
0.8
234 478.0
1.5
257 598
3
281 535
3
1/2
240 721.7
0.9
264 870.9
1.8
289 397
3
314 504
3
2P
3/2
241 071.3
0.8
266 477.5
1.4
292 173
3
318 423
2
1/2
254 774.0
1.1
282 860.3
2.2
311 737
4
341 642
4
4s24p25s4P
1/2
398 054
4
473 532
8
553 867
12
638 999
14
3/2
405 878
3
483 622
6
566 634
12
654 947
12
2P
5/2
412 177
6
490 913
8
574 934
14
664 258
15
1/2
411 076
5
489 084
8
572 400
15
660 981
14
2D
3/2
417 527
4
496 387
5
580 533
10
669 948
11
5/2
431 523
4
512 828
6
599 844
10
692 660
13
2S
3/2
432 898
4
514 585
6
602 011
10
695 263
13
1/2
456 682
6
539 792
8
628 560
12
723 115
14
Table 4
4p5 and 4s24p26s Levels of Y vii
Configuration
Term
J
Energy Level (cm−1)
Uncertainty (cm−1)
4p5 2P
3/2
394 432.2
0.8
1/2
407 066.4
1.0
4s24p26s4P
1/2
602 201
13
3/2
610 563
10
5/2
617 410
13
2P
1/2
612 058
12
3/2
618 828
9
2D
5/2
635 479
10
3/2
635 870
9
2S
1/2
660 459
14
Table 5
Energy Parameters (in cm−1) and Mean Errors Δ of Least-Squares Fits for the 4s24p3 Configurations of Y vii, Zr viii, Nb ix, and Mo xa
Ion
Parameter
HF
Fitted
Fitted–HF
Y vii
Eav
30 535
26 253 ± 2
F2(4p4p)
80 390
66 751 ± 16
0.8303 ± 0.0002
ζ4p
8 638
9 593 ± 5
1.1106 ±0.0006
α(4p4p)
−56 ± 1
Δ
5
Zr viii
Eav
33 185
29 069 ± 4
F2(4p4p)
85 790
71 722 ± 26
0.8360 ± 0.0003
ζ4p
10 669
11 823 ± 7
1.1082 ± 0.0007
α(4p4p)
−60 ±2
Δ
8
Nb ix
Eav
36 014
32 177 ± 3
F2(4p4p)
91 049
76 622 ± 21
0.8415 ± 0.0002
ζ4p
12 975
14 345 ± 5
1.1056 ± 0.0004
α(4p4p)
−65 ±1
Δ
6
Mo x
Eav
39 088
35 673 ± 6
F2(4p4p)
96 194
81 377 ± 44
0.8460 ± 0.0005
ζ4p
15 577
17 230 ± 11
1.1061 ± 0.0007
α(4p4p)
−66 ±3
Δ
13
The value of Eav listed in the HF column is that obtained by diagonalizing the energy matrix with the HF parameters, 4S3/2 level, set at zero.
Table 6
Energy Parameters (in cm−1) and Mean Errors Δ of Least-Squares Fits for the 4s4p4 Configurations of Y vii, Zr viii, Nb ix, and Mo x
Ion
Parameter
HF
Fitted
Fitted–HF
Y vii
Eav
211 724
205 632 ± 144
F2(4p4p)
80 303
74 193 ± 1239
0.924 ± 0.015
G1(4p4s)
106 883
66 590 ± 457
0.623 ± 0.004
ζ4p
8 619
8579 ± 246
0.995 ±0.029
α(4p4p)
−1 344 ± 80
Δ
388
Zr viii
Eav
231 340
227408 ± 150
F2(4p4p)
85 698
79 134 ± 1254
0.923 ± 0.015
G1(4p4s)
113 756
73 055 ± 477
0.642 ± 0.004
ζ4p
10 645
10 738 ± 255
1.009 ± 0.024
α(4p4p)
−1 451 ± 83
Δ
404
Nb ix
Eav
250 157
249 694 ± 163
F2(4p4p)
90 952
84 111 ± 1359
0.925 ± 0.015
G1(4p4s)
120 450
79 165 ± 525
0.657 ± 0.004
ζ4p
12 947
13 157 ± 280
1.016 ± 0.022
α(4p4p)
−1 550 ± 90
Δ
438
Mo x
Eav
268 937
272 641 ± 185
F2(4p4p)
96 095
89 091 ± 1566
0.927 ± 0.016
G1(4p4s)
126 999
85 046 ± 607
0.670 ± 0.005
ζ4p
15 545
15 879 ± 322
1.021 ± 0.021
α(4p4p)
−1 640 ± 103
Δ
496
Table 7
Energy Parameters in (cm−1 and Mean Errors Δ of Least-Squares Fits for the 4s24p25s Configurations of Y vii, Zr viii, Nb ix, and Mo x
Ion
Parameter
HF
Fitted
Fitted–HF
Y vii
Eav
426 349
420 633 ± 6
F2(4p4p)
81 821
66 883 ± 64
0.8174 ± 0.0008
G1(4p5s)
9 032
7 396 ± 20
0.819 ± 0.002
ζ4p
9 072
9 994 ±16
1.102 ± 0.002
α(4p4p)
−71 ±6
Δ
17
Zr viii
Eav
505 190
500 186 ± 6
F2(4p4p)
87 122
71 594 ± 62
0.8218 ± 0.0007
G1(4p5s)
9 844
7 994 ± 19
0.812 ± 0.002
ζ4p
11 146
12 266 ± 14
1.100 ± 0.001
α(4p4p)
−73 ±6
Δ
15
Nb ix
Eav
589 679
585 167 ± 7
F2(4p4p)
92 301
76 240 ± 81
0.8260 ± 0.0009
G1(4p5s)
10 632
8 639 ± 25
0.813 ± 0.002
ζ4p
13 496
14 831 ± 17
1.099 ± 0.001
α(4p4p)
−72 ±8
Δ
19
Mo x
Eav
680 585
675 609 ± 8
F2(4p4p)
97 382
80 S85 ± 87
0.8306 ± 0.0009
G1(4p4s)
11 403
9 255 ± 28
0.812 ± 0.002
ζ4p
16 145
17 750 ± 17
1.099 ± 0.001
α(4p4p)
−72 ± 8
Δ
21
Table 8
Energy Parameters (in cm−1) and Mean Errors Δ of Least-Squares Fits for the 4p5 and 4s24p26s Configurations of Y vii
Configuration
Parameter
HF
Fitted
Fitted–HF
4p5
Eav
422 786
398 644
ζ4p
8 603
8 423
0.979
4s2 4p2 6s
Eav
622 046
624 243 ± 74
F2(4p4p)
82 257
66 853 ± 756
0.813 ± 0.009
G1(4p6s)
3 013
2 277 ± 280
0.756 ± 0.093
ζ4p
9 163
10 200 ± 188
1.113 ± 0.021
α(4p4p)
−92 ± 69
Δ
197
Table 9
Percentage Compositions for the 4s24p3 Levels of Y vii, Zr viii, Nb ix, and Mo x
Calculated Energy Level Values (in cm−1) and Percentage Compositions for the 4s24p26s Configuration of Y vii
J
Observed Energy Levels
Calculated Energy Levels
Observed – Calculated Energy Levels
Percentage (J1j)
Percentage Composition (LS)
1/2
602 201
602 191
10
87% (3P0, 1/2)
72% 4P + 22% 2P + 6% 2S
612 058
612 099
−41
99% (3P1, 1/2)
76% 2P + 24% 4P
660 459
660 459
0
88% (1S0, 1/2)
94% 2S + 4% 4P + 2% 2P
3/2
610 563
610 775
−212
99% (3P1, 1/2)
89% 4P + 11% 2P
618 828
618 740
88
80% (3P2, 1/2)
70% 2P + 23% 2D + 7% 4P
635 870
635 915
−45
80% (1D2, 1/2)
77% 2D + 20% 2P + 3% 4P
5/2
617 410
617 167
243
77% (3P2, 1/2)
81% 4P + 19% 2D
635 479
635 513
−34
77% (1D2, 1/2)
81% 2D + 19% 4P
Table 12
Differences (in cm−1) between Observed Level Values and Those Calculated with the Fitted Values of the Parameters for the 4s24p3, 4s4p4, and 4s24p25s Configurations of Y vii, Zr viii, Nb ix, and Mo x
Configuration
J
Term
Y vii
Zr viii
Nb ix
Mo x
4s24p3
1/2
2P
2
3
2
3
3/2
4S
0
0
0
2
2D
−3
−5
−4
−9
2p
−2
−2
−1
−2
5/2
2D
3
5
4
8
4s4p4
1/2
4P
161
127
98
68
2S
210
182
181
196
2P
−266
−271
−289
−318
3/2
4P
162
183
216
260
2D
−295
−336
−381
−450
2P
60
100
126
152
5/2
4P
−329
−315
−319
−333
2D
292
333
374
437
4s24p25s
1/2
4P
−2
−4
−10
−12
2S
0
0
1
1
2P
−8
−4
2
4
3/2
4P
−13
−10
−11
−9
2D
−8
−11
−19
−19
2P
14
12
7
10
5/2
4P
17
18
21
24
2D
−1
−1
2
2
Table 13
Ionization Energies of Y vii, Zr viii, Nb ix, and Mo x